that's where president obama and mitt romney will go head to head tomorrow night. if you look at this monitor here, this is where the stage is set up. that's live look we're seeing right there. and later on today, run throughs will actually begin. take a look at this video right here. shear a closer look at the arena being transformed into one big television studio. today's dress rehearsal is expected to last all day. the commission says they'll make final adjustments on wednesday just hours prior to the debate. it's not clear yet how many invited guests will fill the venue tomorrow. we're told it will be right around 200. of course, colorado, one of about eight key swing states critical to this year's election. we should mention that mitt romney, they campaigned here in denver yesterday. his wife, ann, will be here later on today. and then on thursday, right after, just hours after the presidential debate, president obama will be campaigning in denver once again. so again, guys, colorado, about one of eight crucial states to this year's election is going to be int